Apparatus for cable inspection

Abstract

Disclosed is an apparatus for cable inspection, which inspects an aerial cable used in electric power transmission, the apparatus including: first and second plates spaced apart from each other; a lower clamp disposed on the first plate; an upper clamp disposed on the second plate to face the lower clamp and having a through hole in a vertical direction; a distance adjustment unit configured to adjust a separation distance between the first and second plates; an indenter indented in a coating of the cable through the through hole; a first load cell configured to measure an indentation force of the indenter and to output a signal corresponding to the measured indentation force; a second load cell disposed under the lower clamp and configured to measure pressure applied to the cable and to output a signal corresponding to the measured pressure; and an indenter moving unit configured to control movement of the indenter. According to the present invention, deterioration of a cable is measured using a plurality of sensors so that measurement accuracy can be improved and measurement of deterioration of the cable can be performed in a state in which the cable is disposed.

What is claimed is: 
     
       1. An apparatus for cable inspection, which inspects an aerial cable used in electric power transmission, the apparatus comprising:
 first and second plates spaced apart from each other; 
 a lower clamp disposed on the first plate; 
 an upper clamp disposed on the second plate to face the lower clamp and having a through hole in a vertical direction; 
 a distance adjustment unit configured to adjust a separation distance between the first and second plates; 
 an indenter indented in a coating of the cable through the through hole; 
 a first load cell configured to measure an indentation force of the indenter and to output a signal corresponding to the measured indentation force; 
 a second load cell disposed under the lower clamp and configured to measure pressure applied to the cable and to output a signal corresponding to the measured pressure; 
 an indenter moving unit configured to control movement of the indenter; 
 a vibrator connected to the lower clamp and configured to apply vibration to the lower clamp to force the lower clamp to vibrate in a horizontal direction; and 
 an LM guide disposed between the lower clamp and the second load cell. 
 
     
     
       2. The apparatus of  claim 1 , wherein facing surfaces of the upper clamp and the lower clamp are concavely formed. 
     
     
       3. The apparatus of  claim 1 , wherein the distance adjustment unit comprises:
 a pair of screw bolts configured to connect both ends of the first plate and both ends of the second plate, respectively; 
 a first support load having one end connected to one end of the first plate, the first support load being connected in parallel with the screw bolts; 
 a first motor disposed on one end of the first support load and having a rotational shaft connected to one of the pair of screw bolts; 
 pulleys disposed on one end of each of the pair of screw bolts; and 
 a belt configured to connect the pulleys so as to deliver a rotational force of the first motor to the screw bolt that is not connected to the first motor. 
 
     
     
       4. The apparatus of  claim 3 , wherein nuts are disposed on both ends of each of the first and second plates and are connected to the screw bolts. 
     
     
       5. The apparatus of  claim 1 , wherein the indenter moving unit comprises:
 a second support load disposed on one side of the upper clamp; 
 a second motor fixed to one end of the second support load; 
 a stem nut disposed on a rotational shaft of the second motor; and 
 a bolt having one end connected to an upper portion of the first load cell and the other end coupled to the stem nut and moving in a vertical direction. 
 
     
     
       6. The apparatus of  claim 5 , wherein the first motor and the second motor are stepping motors. 
     
     
       7. The apparatus of  claim 1 , wherein the vibrator is connected to one side of the lower clamp and configured to apply the vibration to the lower clamp when the cable is disposed between the upper and lower clamps so that any deviation of the cable from the center of the clamps is removed.